Olaf TollefsenOlaf P. Tollefsen was an American philosopher and Professor of Philosophy at St. Anselm College.He is known for his works on aesthetics, ethics and the philosophy of science.BooksFree Choice: A Self-Referential Argument, with Joseph Boyle and Germain Grisez, Notre Dame: University of Notre Dame Press 1979Foundationalism Defended: Essays on Epistemology, Ethics, and Aesthetics, St Anselm College 1994